This is an early 20th century work written in America that means to help parents teach young adults about how to navigate sex and growing up. From the preface:
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The purpose of this book is not only to enable parents, teachers and all matured people, to inform themselves more fully concerning the vital facts of life, but it furnishes a specific guide to all parents, who would know how to tell their children the sacred story of life, and counsel intelligently with their sons and daughters at the ages of greatest danger and give them clean, concise and scientific sex instruction with a view to safeguarding them against the demoralizing half truths of vicious or ignorant schoolmates, servants or companions; and to all others of sufficient age, who have an opportunity for service to innocent and helpless children, who would have a wise word at the right time; and to the young man and young woman, married or single, who would avoid the pit-falls lying in the pathway of those ignorant of God’s sacred laws of nature; and to all mankind who seek to make the world better by more intelligent and better living.”